Method of forming box parts



y 1932- J. SCHMIEDEL 1,856,267

METHOD OF FORMING BOX PARTS Filed Feb. 8, 1930 28 Fig.1

Patented May 3, 1932 UNITED STATES PATENT OFFICE JUHANNES SCHMIEDEL, F DRESDEN, GERMANY, ASSIG-NOR TO THE FIRM UNI- VERSELLE CIGARETTENMASCHINEN-FABRIK J. C. 'Ml j'LLEIt & (10., 0F DRESDEN,

GERMhNY Application filed February 8, 1930, Serial No.

corners of the box.

It has already been proposed also to apply the bindii'lg strip while the box blank is still on the die which helps to shape the box blank in a shaping channel or the like, means belng necessarily y novided which hold the side walls of the shaped blank against the die.

The present invention permits of producing two box parts at the same time in one working operation and at the same time in the same working operation connecting each of them together at their corners by binding strips.

In accordance with the invention a forming block is used for this purpose. The pro duction of box parts by means of a forming block is known per se. It has also been proposed to place the forming block against one edge of the box blank and then to shape the hon blank over the forming block by guiding 0 the forming block with the box blank through a shaping channel.

in accordance with the invention two boX parts are shaped in a single working operation by means of a single forming block of writable width and the binding strip is laid around the two box parts on the forming block in the same working operation.

For carrying the method into effect there provided a device having: a horizontal ruide track on which the two blanks are moved towards one another until they abut with their two side edges on which the forming block is placed and an associated vertical shaping channel in which the bottom of 5 the blank is guided on the forming block and then the lateral side edges are folded inwards whereupon the front edges stlll pro lectuig are bentover in a connected horimantel channel by folding guides and the channel is provided beyond the folding point METHOD OF FORMING BOX PARTS 426,886, and in Germany February 11, 1929.

with diametrically opposite lateral openings of such position and size that the binding strip can be passed through these openings and pressed against each side by transverse dies and can be folded around the corners of the box on the forming block.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a vert cal longitudinal section through the new device, Fig. 2 a plan view and Fig. 3 a vertical cross section on the line 3-3 of Fig. 1.

Referring to the drawings, a horizontal guide track is provided which consists of the two bars 1 and on the thinner parallel guides 3 and 4 of which the two blanks e of the two parts to be formed are pushed towards one another by means of the pushers 5 until the adjacent sides 6of the blanks abut. A forming block rests with its narrow side of corresponding dimensions on this side 6. The blanks rest with their side edges 8 on the guides 3 and 4. I

The forming block 7 resting on the sides 6 of the blanks is held between two dies 9 and 10 which are vertically guided at 11 and 12. After the forming block is clamped with the edges 6 of the blanks between the correspondingly shaped dies 9 and 16 both dies are lowered together so that the forming block passes with the blanks into a vertical shaping channel. The two blanks are first fitted around the forming block 7 in such wise that the bottom. portions of the blanks rest on the sides of the forming block. The side edges 8 of the blanks are folded in the lateral folding guides 13 of the vertical shaping channel 14 in known manner, 1. e. are laid on the front sides of the forming block 7 so that only the upper front side 15 of the blank remains to be folded. This side is folded in the horizontal channel 16 into which the forming block. after the dies 9 and. 10 have released it, is pushed by the horizontallv movable plunger 16 to the folding guides 17 ensuring folding of the front sides 15.

In the channel 16 there is now a forming block with the two box parts already shaped thereon. The channel is provided at two diametrically opposite sides with an opening 18, the height of which openings (see Fig. 3) is such that the front sides 15 of the box are always held in their position on the form ing block and the length (see Fig. 1) of which openings is such that the binding strip can be applied to the work.

At each side of the channel 16 is provided a guide roller 19 rotatable about a horizontal axis. Over each guide roller 19 are laid two binding strips R (see Figs. 2 and 3). These binding strips which in known manner are taken from a spool andare coated with adhesive are each gripped at the front end by suitably operated jaws 20, and moved forward to such an extent that their front ends move into the region of the opening 18. Then U-shaped transverse dies 21 of dimensions corresponding to the openings 18 move toward each other in a vertical plane.

These dies with the aid of the cutter 22 mounted thereon in cooperation with the fixed blades 23 sever the ends of the binding strips to be gummed to the box, and apply these severed ends to the box resting on the forming block 7. The front face 24 of each die 21 presses the two binding strips R against the front sides 15 of the box, while the projections 25 on the dies bend the projecting ends of the binding strips around the corners of the box and press them against the sides 8 of the box. These dies then move back leaving on the forming block 7 two completely formed box parts which are provided by binding strips with corner joints and which can be removed easily from the forming block.

The machine is operated as follows From the drawings it is seen that the die 9 is supported on a machine frame 26 in a guide 11. The movement of the die is effected by a lever 28 which is pivoted to the machine frame at 29 and which by means of forked arms engages the 'die 9 at 9. Intermediate its ends the lever 28 is pivotally connected to a link 30 which latter is pivotally connected at 31 to a lever 32. Said lever 32 is pivotally connected to'the machine frame at 33. A cam roller 32 is mounted intermediate the ends of said lever and tracks a cam 34 keyed on a shaft 35. Said shaft 35 is driven by suitable means (not shown). The movement of the die 10 is effected by a double armed lever 36 pivotally mounted intermediate its ends to the machine frame 26 at 37. The end 36 of the lever is adapted to engage a projection 38 fastened to the die 10. The other end of lever 36 is pivotally attached to a link 39 which latter is pivotally connected to a lever 40. Said lever 40 is pivoted at 41 to the machine frame. A cam roller 41 is mounted intermediate the ends of said lever 40 and tracks a cam 42 also keyed to shaft 35. To insure engagement between roller 41 andcam 42, a tension spring 44 attached to the machine at 43 and to the die 10 at 43 is provided. Said spring tends to always maintain die 10 in raised position.

he movement of die 16 is effected by a link 45 pivotally engaging said die and also pivotally engaging on end of a double armed lever 46. Said lever at 47 is pivoted to the machine frame. The other end of said lever is pivotally connected to a link 48 which latter also pivotally engages a lever 49. Said lever 49 is pivotally mounted to the machine frame at 50. Intermediate its ends said lever 49 is provided with a cam roller 49 which tracks a cam 51 also mounted on shaft 35.

The gripping jaws 20 are operated by being connected to a common cross piece 59 which is mounted on a slide rod 61, the latter being guided in a channel on the machine frame. Said cross piece 59 is pivotally connected to a link 59 which latter is pivotally connected to an arm of a double armed lever 57. Said lever is pivoted at 58 to the machine frame. The free end of lever 57 has a cam roller 57 which tracks a cam 56. Said cam 56 is keyed to a suitably supported shaft 55. Shaft 55, is rotated from main shaft 35 by suitable means such as sprocket wheels 52 and 53 respectively mounted on said shafts and over which a sprocket chain 54 passes.

The vertically guided dies 21 are reciprocated in the following manner. A pin 69 is provided on the upper die 21 and the forked end of one arm of a double-arm lever 67 engages the latter. The lever 67 is pivoted intermediate its ends at 68. The other armof said lever also has a forked end which engages a pin 66 on the end of an arm 63' of a multiarmed lever 63. Said lever 63 is pivoted at 64 to the machine frame. A second arm 63 of saidlever 63 is provided at its end with a cam roller 63* which tracks a cam 62 keyed to shaft 55. A third arm 63 of lever 63 is forked at its end and said forked end engages a pin 65 on the lower die 21. R0-

tation of camv 62 thus causes reciprocal motion of dies 21 to and from each other.

The binding strips R are respectively drawn from reels B and B, suitably supported on the machine frame at and 7 0.

The forming blocks 7 are suitably fed beneath die 9 on a guide track 71 having a stop 73 at its end to insure proper positioning directly over the channel 14. Lateral spring 72 serves to hold the block 7 over the channel until the die 9 pushes the said block into it with the box blanks.

I claim:

1. A method of forming box parts from blanks means of a forming block and form- 2;;

ing corner joints by means of binding strips consisting in shaping by means of a single forming block of suitable width two box parts in a single working operation and laying the binding strips around the two box parts rest ing on the forming block in the same working operation.

2. Apparatus for forming box parts from blanks by means of a forming block and forming corner strips by means of binding strips such aplniratus comprising a horizontal guide track on which the blanks are guided towards one another until their side edges abut, a forming block adapted to be positioned on said side edges, a vertical shaping channel adjacent thereto by which the bottom parts of the blanks are titted around the forming block and the side edges folded inwards, an associated horizontal channel, means for turning over the projecting front edges in such channel, said means consisting of folding guides, said channel provided with lateral diametrically opposite openings, and transverse dies adapted to pass through said opening and to apply the binding strips to the boa: parts.

3. A method of forming two box parts simultaneously comprising folding two box blanks about a single forming block simultaneously and binding the corners of said folded box parts on said block by applying binding strips thereto.

A. method of producing two uniform box parts silnultaneously comprising the steps of disposing box blanks in front of shaping channels and pressing a single forming block against said blanks thereby forcing the latter into said channels to fold the edges of said blanks about said single forming core and then applying binding strips to each of said box parts on said block to bind the corners thereof.

In a device for producing two box parts from blanks simultaneously the combination with shaping channels of a forming core movable through said channels and adaptable in cooperation with the latter to fold the side edges of each of said blanks about said block and means to simultaneously apply binding strips to each of said box parts on said forming block to bind the corners thereof.

b. In a device for producing two box parts from box blanks in a single operation, two shaping channels each having shaping membore, a single forming core movable through said channels and adapted while moving through the first of said channels in cooperation with the shaping members thereof to fold three side edges of each box blank about said block and when moving through the second of said channels, in cooperation With the shaping members thereof to fold the remaining side edge of each box blank about said block and means in said second channel to apply binding strips to each of said boX parts on said forming block to bind the corners thereof.

T. iip iaratus for producing two box parts on a single forming block and applying bind ingstrips to bind the corners of said box movable and in which the fourth side of each blank is folded about said block and means in said second channel for applying binding strips to said box parts on the block to bind the corners thereof. i

In testimony whereof I afiix my signature.

JOHANNES SCHMIEDEL. 

